- caused by the faceMap entry which is a List<bool>, but was being
  treated as List<label> for reading purposes. This is good for ASCII,
  but has completely the wrong sizes for binary.

- as workaround, read a character, which seems to work, but looks very
  much like a hack.

- The zones handling probably needs more work anyhow. There is no
  separate selection for them, and separate handling of fields per
  zone.